[stellar678]

I'd venture that you're looking at hundreds of people at harvest time for 720 acres of lettuce. I suppose the spikey nature of the labor demand is another reason why automation could be a better approach.

[giantg2]

The only question then, is what does that unskilled labor do as an alternative?

As a side note, the labor is generally migratory so they move the the next crop that needs harvesting.